Is the app available in Europe or in the Google Play store? Will phones be able to handle 300kbit/s network speed in case an automatic update is running or an app is trying to download something?
> Will phones be able to handle 300kbit/s network speed in case an automatic update is running or an app is trying to download something?
"Handle" what exactly?
If your phone downloads data, it will consume those 300kbit/s
Android Devices with Android 7.0 or higher should have a "Data Saver" feature (check buttons in Notification area) which can limit data-traffic to foreground apps, in case you want to reduce the amount of "data vampires". Especially helpful when abroad...
iOS has a 'low data' mode option, which is helpful for low caps (and presumably, low speed) connections, as it doesn't do automatic app updates or photo syncing when that's enabled. It prompts whenever you want to download an app or an update with the size of the update and "are you sure?", which is handy just to have as a default anyway.
"Handle" what exactly?
If your phone downloads data, it will consume those 300kbit/s
Android Devices with Android 7.0 or higher should have a "Data Saver" feature (check buttons in Notification area) which can limit data-traffic to foreground apps, in case you want to reduce the amount of "data vampires". Especially helpful when abroad...